1 Chronicles 16:39

Zadok the priest; not the high priest, but the second and the chief priest at Gibeon, where the famous tabernacle and altar made by Moses still were, 1 Chronicles 21:29 2 Chronicles 1:3; where also the ordinary sacrifices were offered, and the stated and public worship of God was performed, as it here follows, for which the priests were placed there; as the extraordinary worship was before the ark upon great occasions, as when God was consulted, which was to be done before the ark and by the high priest, Exodus 28:12,20,21,22, who now was Abiathar; who therefore abode here with the ark, when Zadok was left at Gibeon.